Since you've had rats for so long, I have a question. The grey one sneezes a bit more often than the other one. The rat magazine we got said that rats should not sneeze a lot. However, he eats a lot (he's quite a bit bigger than the other one), so he seems healthy. He doesn't have any mucous discharge. Do you think he's okay? There's a 14-day return policy, and I want to make sure I didn't get an unhealthy guy.